DE3006621C2 - Arrangement for recording information signals on a rotating recording medium - Google Patents

Description

demodulation (PCM) or differential modulation, converted into a digital signal and then through a digital modulation process, for example modified frequency modulation (MFM) digitally modulated or coded

The recording process has heretofore been carried out by applying a carrier wave to the information signal was frequency modulated. In the event that the audio signal has two channels, you can Audio signal very light with a large dynamic range and high quality on the recording medium record and remove from the recording medium. However, if the audio signal has four channels, for example, the transmission bit rate becomes twice as high as in the case of two channels. For this Basically, in the last-mentioned case, one has to reduce the frequency of the carrier oscillation by a considerable amount Increase the amount in order to be able to carry out the frequency modulation. The consequence of this is that one is responsible for the record and playback a wide frequency band required In practice, however, the recording / Playback frequency band limited, due to the properties of the record carrier itself and in view of the organizational structure of the recording and playback devices.

Further, it should be noted that even in the case of two audio signal channels, the frequency band for recording and playback cannot be made very wide if, for example, the plate-shaped Recording medium results in a smaller diameter and on this smaller recording medium Audio signal with a temporal length as in the case of a record carrier with a large diameter records.

One possible solution to this problem seems to be therein to pass a signal obtained by digital modulation directly, i.e. H. without frequency modulation. If one uses such a direct recording method, that is for recording and Playback required band not as wide as in the case of using the frequency modulation method. Thus, the problem described above is solved.

But if you directly record a signal obtained by digital modulation, appear in the frequency spectrum unwanted frequency components of the recorded and reproduced signal, extending down to a low frequency range including a frequency that is the Corresponds to pilot signal frequency. This is explained in detail in the description of the figures with reference to the drawing explained. For this reason, it comes between the unwanted frequency component and the unwanted Frequency components and the pilot signal to a mutual interference or interference. This degrades the recording and reproducing properties and the tracking control In some cases, the reproduction needle can no longer be executed with the required stability will.

One measure to solve this problem is to change the time base of the digitally modulated signal to compress, in such a way that it is in the artificial horizontal sync signal duration is no longer present, and it is converted into one kind in each period corresponding to one horizontal scanning period of block in order to avoid the mutual superposition or interference mentioned above. if but one prevents an information signal from being present in the artificial horizontal synchronization signal duration it is difficult to cause a clock signal to demodulate in the display device, to synchronize with a clock signal that is used in the recording arrangement for the modulation became. In addition, since a component is added to the digital signal having two values, in If a signal does not exist, the recording must be made with a total of three values. In this case one cannot transmit the signal in such a stable manner as in the case of recording with only run two values. Another problem is that you have a large one for signal transmission Frequency range required

The possibility of temporal compression of an audio signal is referred to DE-OS 23 17 490 referenced. There the compressed Audio signal recorded on a magnetic disk so that it is within the horizontal or vertical blanking periods of the television signal does not exist. In this context, however, only one system is considered in which a frequency-modulated carrier wave is recorded with a carrier on the magnetic disk which has been frequency-modulated with the time-compressed analog audio signal & r The direct Recording of a time-compressed digital audio signal on a recording medium as well as the Recording of pilot signals on the recording medium and the associated problems cannot be found in this publication.

Based on an arrangement for recording information signals on a rotating recording medium of the generic type, the invention is based on the object, the converted digital To record information signal directly on the record carrier in such a way that it is between the pilot signals required for tracking control and the converted digital information signal to no mutual disturbance or interference -; ommt

This object is achieved in an arrangement according to the preamble of claim 1 by the features solved in the characterizing part of claim 1. This ensures that the recorded information signal can be reproduced with high quality. This applies in particular to the recording of an information signal, which originally does not contain a synchronization signal, for example an audio signal.

Preferred developments and expedient refinements of the invention are set out in the subclaims 2 to 5 characterized. According to claim 5, the pilot signal comprises a first and a second pilot signal with frequencies that differ from each other, alternating in the direction of the lengthways to the Pilot signal tracks adjacent to the main track are recorded.

The invention is explained below with reference to drawings. It proves

F i g. 1 is a block diagram of an embodiment of an information signal recording arrangement according to the invention,

F i g. 2A and 2B waveforms of a PCM signal and an MFM signal, namely in the event that the logical values of the PCM signal are all 1,

Fig. 2C is a graph of the frequency spectrum a modulator output signal for the above case,

F i g. 3A and 3B waveforms of a PCM-Si

gnals and an MFM signal in the event that the logic values of the PCM signal alternate Are 1 and 0,

3C is a graphical representation of the frequency spectrum a modulator output signal for the case according to FIGS. 3A and 3B,

4A and 4B waveforms of a PCM signal and an MFM signal, specifically for the case that the logic values of the PCM signal are arbitrary,

4C is a graphical representation of the frequency spectrum of a modulator output signal for the case as in FIGS. 4A and 4B ₁

F i g. 5 shows a waveform of a digital signal that conforms to the format of a common video signal,

F i g. 6A and 6B waveforms of a main component

Fig. 2A matched the digital signal shown. Thus, when the clock pulse frequency is 6.4 MHz, the MFM signal has a signal frequency of 3.2 MHz. The frequency spectrum of the MFM signal is shown in FIG. 2C shown. In addition to the basic oscillation with the frequency of 3.2 M Hz, there is a third harmonic with a frequency of 9.6 MHz, a fifth harmonic with a frequency of 16MHz and other harmonics of the order (2m-1), where m

to is 3 or an integer. that is greater than three.

In the event that the input signal fed to the modulator 14 is a PCM signal, for example the representation according to FIG. 3A is, i.e. H. a signal with alternating logic values I and 0.

occurs at the output of the modulator 14 an MFM signal with a square-wave oscillation curve accordingly the representation according to Figure 3B. the

Al *

IwIrSnI II. A *

proper recording arrangement,

F i g. Fig. 7 is an enlarged perspective view of a reproducing needle that is carrying a recording medium scans on the signals have been recorded with the recording arrangement according to the invention are and

F i g. 8 shows a block diagram of an exemplary embodiment of a display arrangement for displaying signals; recorded on a recording medium with the recording arrangement according to the invention have been.

In the case of the FIG. 1 illustrated embodiment of a recording arrangement according to the invention an analog audio signal is fed to an input terminal 11 and from there to an analog-digital converter 12, in which it is converted into parallel digital signals. These parallel digital signals get to a parallel-serial converter 13, in which with the help of a clock signal from a main oscillator 16 a parallel-to-series conversion takes place. The converter 13 outputs a signal, for example is pulse code modulated and is called PCM signal in the following. The PCM signal comes to an MFM modulator 14 in which it digitally modulates or encodes using the clock signal from main oscillator 16 is, for example using a modified frequency modulation, which is described below MFM is called.

Other types of modulation are also possible. For example, a differential modulation can be used instead of the pulse code emulation PCM. Instead of the modified frequency modulation MFM, another digital modulation is possible, for example without return to zero (NRZ), inverted without return to zero (NRZI), phase coding (PE), group- coded recording (GCR) and three-position modulation (3P ₁ VfJl that represents a rectangular oscillation The output signal of the modulator 14 arrives as a modulation signal directly to a light modulator 15 without being frequency-modulated.

In the event that the PCM signal supplied to the modulator 14 is a signal in which the logic values are all 1, as shown in FIG. 2A is shown. takes that MFM signal occurring at the output of the modulator 14 corresponds to a rectangular waveform the representation according to FIG. 2B. The frequency of the MFM signal has a value half that The value of the frequency of the clock pulses of the main oscillator 16 corresponds to the frequency of the clock pulses of the Main oscillator 16 matches the frequency of the pulse frequency. The frequency spectrum of this signal is in FIG. 3C. In the case of a speed limit At 6.4 MHz, there is a fundamental oscillation with a frequency of 1.6 MHz, along with a third harmonic a frequency of 4.8 MHz, a fifth harmonic with a frequency of 8.0MHz and higher harmonics odd order.

Thus, if the repetition frequency of the MFM signal occurring at the output cki modulator 14 is a has a single frequency, this repetition frequency is the fundamental, and one Component with a lower frequency does not exist.

The PCM signal which is fed as an input signal to the modulator 14, however, actually changes depending on the input connection 11

lying audio signal. The change in the logical values is then arbitrary, and a random digital signal occurs, as shown in FIG. 4A is shown. If such a PCM signal is fed to the modulator 14 as an input signal, the MFM signal appearing at the output of the modulator 14 has a waveform corresponding to the illustration according to FIG. 4B. In the case of a clock pulse frequency of 6.4 MHz, this waveform contains a combination of rectangular waves with frequencies of 1.6 MHz, 2.13 MHz and 32 MHz. The frequency spectrum of this signal is shown in FIG. 4C, and it includes a component having a considerably lower frequency.
On the other hand, the Piiotsignaie serving for tracking have the same frequencies (5H.4 kHz and 7153 kHz in the embodiment of the invention) as the pilot signals that are used for the record carrier on which the video signal is recorded (video disk), so that the record carrier on which was recorded with the recording arrangement according to the invention, can also be reproduced by an arrangement or a device which is used for video disks. The signal, the frequency spectrum of which is shown in FIG. 4C, however, has frequency components which are the frequencies of the pilot signals mentioned above and frequencies in the vicinity of the pilot signal frequencies partially overlap the main track, record and then scan these tracks for signal reproduction, there would be interference between the pilot signals and those mentioned above

Frequency components. Purpose of the invention The recording arrangement is to avoid the occurrence of such interference. It does this as follows.

The main oscillator 16 emits a single frequency signal high frequency to a control signal generator 17 supplied, in which a control signal with the horizontal scan << > :( de of the television video signal or with a period close to the horizontal scanning period lies. This control signal is sent to a pilot signal generator 18 and a continuous signal generator 19, which is referred to in the following as a continuous signal Signal generated whose time period or duration corresponds to the horizontal synchronizing signal duration.

The pilot signal generator 18 generates in an audio frequency burst condition a first and a second pilot signal fp 1 and fp 2 of mutually different individual ifcqücri / .cN in jcdci period VOü of a duration which corresponds to the horizontal scanning duration of the video signal, and moreover only within the artificial horizontal synchronization signal duration which is the same is the difference obtained by subtracting a duration corresponding to the existence of a color burst or color sync signal from the horizontal blanking duration. The frequencies of the first and second pilot signals fp 1 and fp 2 are selected to coincide with those of the first and second pilot signals used for the video disk for the sake of interchangeability. The frequencies of the pilot signals ^ fp 1 and fp 2 are selected, for example, so that they correspond to one fifth and one seventh of the chrominance subcarrier frequency of 3.58 MHz of the color video signal, ie 715.9 kHz and 511.4 kHz. Further, the pilot signal generator 18 generates a third pilot signal fp3 every period of rotation of an original recording disk 32,

The pilot signals fp 1, fp 2 and fp 3 generated in this way are supplied to a switch device 20, through which the pilot signal fp 3 passes as it is, and in which the pilot signals fp 1 and fp 2 alternate at every full revolution or revolution period of the Original recording plate 32 can be switched in such a manner that they come to a light amount control signal generator 21 and a light modulator 22 alternately in succession.

The continuous signal appearing at the output of the continuous signal generator 19 is sent to the parallel-to-series converter 13 supplied. The parallel-serial converter works in dependence on the continuous signal in such a way to a to convert the continuous digital information signal fed to it into a serial digital signal, the is so compressed with respect to the time base that for each Horizontal scanning duration of this digital information signal during that of the horizontal synchronizing signal corresponding duration does not exist and exists at all other times, and which is also processed in this way is that a digital signal of a single frequency signal exists in this horizontal synchronizing signal duration

A laser light beam from a laser light source 23 is reflected by a mirror 24 and used to adjust the amount of light sent through a light modulator 25. The laser light beam adjusted in this way is projected onto a half mirror 26, which transmits part of the light to the light modulator 22 and one other part of the light to the light modulator 15 is reflected. The MFM signal appearing at the output of the modulator 14 arrives at the main information signal Light modulator 15 in order to modulate the light beam reflected by the half mirror 26 there. The resulting The first modulated light beam is projected onto a mirror 27, which reflects it and passes through a polarizing prism 29 sends. The light that has passed through the polarization prism 29 is reflected by a mirror 30 and passes an objective lens 31. It is then focused on a photosensitive medium, which acts as a coating is placed on the original recording plate 32 made of glass, for example. In this way

ίο becomes the first modulated light beam in the main track recorded. The beam portion that has passed through the half mirror 26 is in the light modulator 22 modulated by the above-mentioned pilot signals and then arrives after reflection at a mirror 28 as second modulated light beam into the polarization prism 29. Behind the polarization prism 29 is the second modulated light beam reflected from mirror 30 and through the GbjcktiviinSc 31 gcSehicki. Ef will be on the

Original recording plate 32 focused and in the Pi

Plumb signal track recorded.

The original recording plate 32, which is located on a turntable 33, is rotated at a speed of 900 rpm by means of a motor 34 Incline shifted in the direction of an arrow X drawn. As a result, the MFM signal and the pilot signals are recorded on the original recording disk in a spiral track running from the outer edge of the disk toward the center. The recording takes place with the aid of the first and the second modulated light beam.
To detect the displacement position of the original recording plate 32 and the turntable 33 along the direction of the arrow X shown , a displacement position detector 35 is provided with a potentiometer which generates a DC voltage corresponding to the displacement position. This DC voltage is fed to a DC voltage amplifier 36 and then reaches the light modulator 25, which adjusts the amount of light, in order to control the intensity of the light beam from the laser light source 23 as a function of the position of the light beam spot focused on the plate 32, measured in the radial direction of the original recording plate 32. With this construction and operation of the recording apparatus, the influence of the difference in the relative linear velocity due to the position of the light beam spot in the radial direction of the original recording plate 32 is compensated for

The light amount control signal generator 21 generates a control signal indicating the intensity of the laser light beam is reduced only in the periods in which the pilot signals exist, namely with respect to the laser light beam intensity in the other periods. This control signal is used by the light modulator to adjust the amount of light 25. Consequently, the light intensity of the light beam that has passed through the light modulator 25 is shown in the periods corresponding to the periods during which the pilot signals exist in terms of the light beam intensity reduced in the other periods so that the recording takes place perfectly evenly

The original recording disk 32 described in the above Way exposed to light is subjected to a development process known per se, and it are then after a conventional plate production

9 10

technically finished recorded disks. The MFM signal exists, as it contains the disk recorded in FIG. 6A, for example a disk. The artificial horizontal synchronization signal, a substrate in the shape of a polyvinyl acetate (PVAC), in duration corresponds to different times than the color syndrome, the troughs in the form of the spiral-shaped track in the horizontal blanking period. In which are formed a metallic artificial horizontal synchronizing signal duration TiI constituting an electrode see coating on the disc-shaped substrate, and a pilot signal / pi or fp 2 is recorded, which is caused by a dielectric on the metal coating, a raised cosine wave Movie. One can also assume the disc-shaped subjection form, as it is shown in FIG.
their material. Thus, through the use of the invention

The logical values of the MFM signal at the output, if a recording arrangement of a single frequency side modulator 14 were to change, generally change arbitrarily also in the artificial horizontal synchronization or randomly, and the frequency spectrum is recorded for a duration TH. Thus the problem takes on the one shown in FIG. 4C. 15 eliminated that occurs when the existence of a signal ^; n The MFM signal thus has components with the frequency of this duration being avoided, as is the case in sequences 715.9 kHz and 511.4 kHz of the first and two- connection with FIG. 5 is explained. Since additional pilot signals fp 1 and fp 2. Furthermore, the value of the reference signal is not set, pilot signals are recorded with a recording level, the amplitude of this signal can be completely recorded by the posider by about 20 dB compared to the recording level 20 tive to the negative, and the signal is recorded with the MFM, which is the main information signal, having a large signal-to-noise ratio and as-signal is degraded so that the entire recording is reproduced.

execution is carried out uniformly. Therefore, if the pi- Another advantageous measure is to

lot signals and the MFM signal simultaneously on tracks that have a frequency component lower than that

are recorded, which are partially upper lobes, ha- 25 the fundamental oscillation of the individual frequency, does not exist,

ben the recording level of the pilot signals and the level as described above with reference to FIG. 2 and 3 has been explained,

Recording levels! the low frequency component because the frequency of the signal that is in the artificial horizon

ten of the MFM signal about the same order of magnitude, zontalsynchronisiersignaldauer TH is recorded,

as can also be seen from Fig. 4C, so that this is a single frequency.

Pilot signals normally not sampled see the single frequency signal and the pilot signals

can. interference does not occur.

One measure to overcome this problem. An embodiment of a panel made using the

consists in detecting the existence of the MFM signal in the recording arrangement according to the invention.

To avoid rizontalsynchronisiersignaldauer PH , as has been drawn, is to be used in the following on the basis of the

it in the fig. 5 and the pilot signals in FIGS. 7 will be explained. The surface 41 of those

Pilot signal traces during this period PH in top some places of the plate 40 in which no troughs or Mood with the format of the video signal to be recorded, is flat or planar and shows

nen. A signal that the horizontal synchronizing signal has no guide groove. The troughs 42 of the main track are

in this period PH corresponds, however, to that in the plate 40 depending on the MFM signal

negative side of the reference voltage REF ■ VOLT 40 provided. In FIG. 7 is only part of the Si

recorded, and the togic value 1 of the MFM signal track windings rl, f2 and i3 shown, which of the

gnals, on the positive side of the reference span, artificial horizontal synchronization signal duration is developed.

recorded The stable decrease or repetition in which the signal of the single frequency (1.6 MHz)

There would be this reference voltage is more difficult in the event that the sequence of wells 42 is recorded.

of a direct recording system than in the case of a 45. In the embodiment shown, the wells are

frequency modulated system. Furthermore, the Horizon 42 is designed so that one edge line of each track

sampling frequency in a video format of a color video - roughly with the edge line of the adjacent track together.

Deo signal of the NTSC system, for example, is missing This means that the neighboring track wind-

15.734 kHz. If a signal from 1.6MHz to 3.2 MHz fertilize il, f2, 1 3, ... one after the other

is recorded in accordance with it, so it will limit.

Ratio of the maximum frequency 3.2 MHz to the mini- At central points (the frequency 15.734 kHz in the embodiment shown equals 203.4: 1 ) the frequency and phase characteristics must run flat over a line of the mutually adjacent tracks f 1 and / 2, very large frequency range, roughly in the middle between the centers. In the 55 1 2 and 1 3, ... pilot signal troughs 43 and 44 formed in practice, it is therefore extremely difficult to correspond to the above-mentioned pilot signals with the frequency contalsynchronization signal duration in this way under zen fp 1 and fp 2 during the hori- zon.

Use the direct recording method under The Bottom 51 of Scan or Playback Prevention the existence of the MFM signal stable and needle 50 has a point of maximum width that is greater than to record and reproduce sufficiently well. 60 the track increment on disk 40 is one electrode

In the case of the recording arrangement 52 according to the invention, the synchronizing duration signal generator 19 supplies the rear side of the reproducing needle on the rear edge of the underside 51 on the voltage When a signal arrow V rotates at the output of the modulator 14, the display needle 50 scans the upper step, where a rectangular vibration surface of the plate 40 scans. The electrostatic signal of a single frequency (for example 1.6 MHz capacitance between the electrode 52 and an elekbei the embodiment of the invention) is detected in the trically conductive layer, which covers the entire Oberfläkünstliehcn Horizonlalsynchronisiersignaldaucr TH in front of the plate This electrostatic capacity

11 12

changes depending on the formation of the recovery frequency, which is recorded along the main track.

Wells 42. This is recorded in the wells 42, and the signals fp I and fp 2 for track tracking

zr <.: hnete main information signal sampled. run that on the auxiliary lane to both or one side

At the same time, the electrode 52 records the pilots adjacent to the main track,

signals with the frequencies fpi and fp2 removed, 5 sampled simultaneously. But since the rectangular

the vibration is selected in the form of the troughs 43 and 44 on the plate so that it repeats

/ cichnct are. If the center of the electrode has the lungs frequency that has no components of the "fre-

Center line of the track deviates, occurs in the decreased frequency bands which contains signals fp 1 and fp 2 , occurs between

a level difference with the pilot signals, and with the help of the removed rectangular oscillation

a control circuit is a tracking servo operation and the picked up signals fpi and fp2

tion executed. no mutual interference or superposition.

A signal previously recorded on disk 40, during the period that the playback needle

which now as a weak change in the electrostatic 50 reproduces a duration that is not the

see the capacity of the display needle 50 decreased- artificial hori'.ontalsynchronisiersignaldauer one

is converted in a manner known per se into a signal that has already been recorded electrically along the main track

cal signal transferred. A part of this electrical si- act is, however, in the one separated from the main track.

8 signal components taken from the fre-

fed. Contain the frequency bands of the signals fp 1 and fp2 applied to an input connection 61. There

The signal passes through an amplifier 62 to one, but in this case the one used for tracking

Frequency detection circuit 63, which does not record a certain 20 signals fp 1 and fp 2 in the auxiliary tracks. Frequens detected, and recorded to a gate circuit 64th, can be between that of the main track

The frequency detection circuit 63 has a signal picked up in parallel and the signals which are connected to the input of a bandpass filter for tracking, so that only the frequency component of the square wave occurs. In addition, during this re-oscillation of the single frequency, which would not generate any gate pulses in the 25 or sampling period, artificial horizontal synchronization signal duration of the even if the frequency components of the rectangular oscillation of the tracking signals recorded for the track is recorded in the main track of the main track, and it has a band-unsampled signal during a period of time pre-feed suppression filter. that would only be these frequency components, which are not suppressed by the artificial horenten. The frequency detection circuit 63 30 acts zontalsynchronisiersignaldauer. Thus, it is possible, generated on the basis of a comparison of the levels of the output, to carry out the tracking control operation in the normal manner without negative input signals from these filter pulses in the form of gate!
pulses that the gate circuit 64 only during a continuous In the in the F i g. 1, which shows the artificial horizontal synchronizing game of the recording arrangement according to the invention in the sampled or recovered time, the signal that corresponds to the artificial signal is recorded in this way occurring removed Si- is, not a rectangular oscillation with gna! forwarded via the gate circuit 64 to act on a single repetition frequency. Rather, gate impulses that are passed on only during a period of time can also have a square-wave oscillation ne which corresponds to the artificial horizontal synchronism with small frequency fluctuations or any duration of the signal. The signal passed on in this way can be used as the signal which can be regarded as being repeated individually to a tracking control signal generator 65th.

The tracking control signal generator 65 includes two band- when the pilot signals have very little effect

pass filter, which for tracking control the signals fp 1 and fp 2 have the MFM signal and the lower frequency

separate from each other, two detection circuits, the 45 components with the help of a filter in the playback

the output signals of these two bandpass filter detection arrangements are removed to a sufficient extent

sen, a differential amplifier that can handle the output signals, you can also record in a

Ie of the two detection circuits are supplied. Make a duration or period that is not part of the artificial

and a switch device corresponding to In depending on the horizontal synchronizing signal duration

the above-mentioned third reference or pilot signal 50 in this case, a signal that is no interference frequency

for each full revolution of the plate 40, the signal sequence component in a pilot signal frequency band

transmission path generated by the two detection circuits, for example the above-mentioned individual frequency

The frequency signal, in the main track in the artificial hori-

Control signal generator 65 thus delivers its Auszontalsynchronisiersignaldauer recorded

output a tracking control signal from the differential amplifier 55

is applied to an output terminal 66. The track - 4 sheets of drawings

control signal then arrives at a not shown

Movement mechanism that controls the playback needle in
radial direction of the plate in such a way

rejects the fact that the reproduction needle is constantly
line follows the main track on the record

Even during the period in which the reproduction needle 50 in the artificial horizontal sync signal duration normal tracking on the disk

40 carries out only one embodiment of one for 65
represents the purposes of the invention suitable recording carrier or recording medium
the rectangular oscillation of the individual weights

Claims (5)

1 2 signal generator (18) for tracking control a patent claims: first and a second pilot signal with mutually different frequencies generated that the 1. Arrangement for recording information drawing device the first and the second position signals on a rotating recording plumbing signal alternately along the carrier, containing pilot signal tracks and that generated an analog-to-digital converter, which an informa- rectangular oscillation signal about almost no tion signal is converted into parallel digital signals, frequency components have the same frequency components Parallel-to-serial converter, which is the parallel sequences of the first and second pilot signals digital signals are in a continuous digital location or in the vicinity of these frequencies, gnal using a Clock signal from a main oscillator, a control signal generator that is dependent on
from the clock signal a control signal with the repetition frequency of an artificial synchronizing signal. Above the control signal for tracking control pilot handle of claim 1. signals generated during a period of time that is of such an arrangement is its principal nature Duration of the artificial · Synchronisicrsignals ent- 20 according to DE-OS 27 15 573 is known in addition speaks and also refer to the publication »Elektrisches Nachricheine Recording device operating on a site «. Volume 51, No. 2,1976, pages 124 to 130 record carriers the continuous digital signal from which it is known to be a television signal along a main track and convert the pilot signals along a Pi digital signal by means of differential plumbing signal tracks records the pulse code modulation (DPCM) sent to the main track 25, and the converted one adjoin, characterized in transmitting digital signal. that also a continuous signal generator (19) is present In the prior art according to DE-OS is the in each case for a period of time that corresponds to the duration of 27 15 573, from which the invention is based, are in artificial synchronizing signal corresponds to a recording arrangement in accordance Dauersigna '"generated 30 with a main information signal, for example a that the parallel-serial converter (13) also the NEM television video signal, troughs or pits along a continuous digitate signal compressed in such a way that spiral-shaped track on a plate-shaped it was recorded in a different period of time than the duration of the drawing without the formation of a groove. of the artificial synchronizing signal is present, records and in a display device is the and, in addition, a rectangular Schwin- 35 spiral-shaped trace covered by a reproduction needle. The signal of a specific frequency is generated continuously around the recorded information signal. to be take and reproduce that in the period of artificial synchronization. Reference or pilot signal gnals is available and almost no fre- quencies are shown on the informafion sig? alspur or in the components that are recorded equal to the frequencies in the vicinity of the information signal track the pilot signals are or are in the vicinity. During playback, the pilot signals are combined these frequencies are, and men decreased with the information signal. In from- that the recording device along the main dependency of the picked up pilot signals track of the recording medium directly the compressed follows a tracking servo control in such a mated digital information signal to each other in such a way that the reproducing needle precisely corresponds to the recorded in a row with the square-wave oscillation signal 45 follows the nth track, recorded Since the recorded track has no groove, exists 2. Arrangement according to claim 1, characterized in that there is no risk that the playback adei or the record, that the rectangular vibration sign carrier will be damaged. Furthermore gnal with the specific frequency a square feed, the display needle can the same section of the Sample a moderate vibration signal with a single frequency so that the track is repeated so that special reproduction is possible, which is higher than the frequencies of the pilot signals, such as still image playback, slow motion image 3. Arrangement according to claim 1 or 2, characterized in playback or quick image playback, easily identified that the information signal is an au- bar. diosignal is thus in the known arrangement with regard to the 4. Arrangement according to one of the preceding information signals, no interference occurs, the Proverbs characterized in that the re-pilot signals are recorded during a period which fetch frequency of the artificial Synchronisiersi- for example the horizontal synchronization signal duration gnals is a frequency corresponding to one horizontal scanning of a television video signal. If under Verfrequency a standardized color television video turn of the arrangement described above as an information signal corresponds, and that the duration of the artificial eo mationssignal an audio signal are recorded When synchronizing signal is a period of time, the pilot signal is picked up in a time interval corresponds, which is characterized by the subtraction, that of the horizontal synchronization signal duration a time period in which a burst signal corresponds to the television video signal and in the following exists from the horizontal blanking period of the hori- called artificial horizontal synchronizing signal period zontalsynchronizationsignal of the color television video 65 is in order to be interchangeable with a recorder results. to ensure that a teletype video 5. Arrangement according to one of the preceding audio signals is recorded. The utterance to be recorded characterized in that the pilot video signal is generated by modulation, for example pulse code